package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;

    /**
     * 根据开始时间和结束时间统计营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合存begin到end之间的所有天数
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        if (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        // 查询date日期对应的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);

            // 查询营业额
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 根据开始和结束时间统计用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        // 存储日期数据
        List<LocalDate> localDateList = new ArrayList<>();
        localDateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            localDateList.add(begin);
        }

        // 存储用户总量
        List<Integer> totalUserList = new ArrayList<>();
        // 存储新增用户
        List<Integer> newUserList = new ArrayList<>();

        for (LocalDate localDate : localDateList) {
            // 计算当前时间的最小（00:00:00）和最大值（23:59:9999）
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);

            // 用map存储查询条件
            Map map = new HashMap();
            map.put("end", endTime);

            // 总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            // 新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }


        return UserReportVO.builder()
                .dateList(StringUtils.join(localDateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 根据开始和结束时间统计订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO ordersStatistics(LocalDate begin, LocalDate end) {
        // 存储日期数据
        List<LocalDate> DateList = new ArrayList<>();
        DateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            DateList.add(begin);
        }

        // 存储每日订单数量
        List<Integer> orderCountList = new ArrayList<>();
        // 存储每日有效订单数量
        List<Integer> validOrderCountList = new ArrayList<>();

        for (LocalDate localDate : DateList) {
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);

            // 查询订单总数
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            orderCountList.add(orderCount);

            // 查询订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            validOrderCountList.add(validOrderCount);

        }

        // 计算时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        // 计算时间区间内的有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        // 计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(DateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCount, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名统计
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO top10Statistics(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        // Top10菜品套餐名列表
        String nameList = StringUtils.join(goodsSalesDTOList.stream()
                .map(GoodsSalesDTO::getName)
                .collect(Collectors.toList()), ",");

        // Top10销量列表
        String numberList = StringUtils.join(goodsSalesDTOList.stream()
                .map(GoodsSalesDTO::getNumber)
                .collect(Collectors.toList()), ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        // 用map存储查询条件
        Map map = new HashMap();
        map.put("begin", begin);
        map.put("end", end);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }
}






